Chapter 12: Smart Charts

Shobna has four grandparents.

Madhav has eight great, great grandparents in all.

32 elders will be in the VII generation of his family.

VI generation: 8 × 2 = 16

VII generation: 16 × 2 = 32

Number of members in VII generation of Madhav’s family = 32

Number of members in VIII generation of Madhav’s family = 32 × 2 = 64

Number of members in IX generation of Madhav’s family = 64 × 2 = 128

Thus, in the IX generation, the number of elders in Madhav’s family will be 128.

Growth Chart of a Plant:

Amit sowed a few seeds of moong dal in the ground. The height of the plant grew to 1.4 cm in the first four days. After that, it started growing faster.

Amit measured the height of the plant after every four days and put a dot on the chart. For example, if you look at the dot marked on the fourth day, you can see on the left side scale that it is 1.4 cm high.

Now look at the height of each dot in cm and check from the table if he has marked the dots correctly.

Find out from the growth chart:

a) Between which days did the length of the plant change the most?

i) 0-4, ii) 4-8, iii) 8-12, iv) 12-16, v) 16-20

iii) 8-12

b) What could be the length of this plant on the 14th day? Guess.

i) 8.7 cm, ii) 9.9 cm, iii) 10.2 cm, iv) 10.5 cm

ii) 9.9 cm

c) Will the plant keep growing all the time? What will be its length on the 100th day? Make a guess!

No, I think its length would be about 17-18 cm on the 100^th day.